Manufacture of steam-boiler furnaces and flues.



No. 794.091. PATENTED JULY 4:. I905. E. GEARING & W. RAINFORTH. MANUFACTURE OF STEAM BOILER FURNACES AND FLUES.

APPLICATION FILED FEB.16. 1904.

2 SHEETS-SHEET l.

110.794.091. PATENTED JULY 4-, 1905. E. GEAEING- & W. RAINPORTH. MANUFACTURE OF STEAM BOILER FURNACES AND PLUES.

ATPLIGATION FILED PEB,16, 1904.

2 SHEETSSHEET 2.

No. reaper Patented (luiy 4t, 1905?.

fitiFlElTf tidbit.

ERNEST Gi-EARING, 0F HARHUU-ATE, AND Vl llQLlAli l RAlNFORTH, OF LEEDS, ENGLAND.

SPECIFICATION forming; part of Letters Patent No. '?9s'i,091, dated July &, 1905. Original application filed 'ig'ust 18, 903, Serial No. 169,890. Divided and this application filed February 16, 1904. Serial No. 193,869.

To (all H/ZI/OIII/ it may concern:

Be it known that we,l 11-:Nns'rGnnmnmresiding at Harrogate, and VVlLLIAM ltAInron'rni, residing atUpperArmley,Leeds,in the county of York, England, subjects of the King of iil'OELl) Britain and .lreland, have invented improvements in the Manufacture of Steamiltoiler Furnaces and Flues, of which the following is a specification.

This invention has reference to the manufacture of steam-lmiler furnaces or lines of the kinds that have corrugations or hollow strengthening ribs or ridges formed in their walls.

The invention, which more especially relates to the manufacture of furnaces or iililGS having deep steep-sided ribs or ridges, originally was included in our application iilerial No. 169,890, of which this is a (liViSiOl'i.

According to the present invention such corrugatiol'is, ribs, or ridges (hereinafter refe rred to as rid are produced by su omitting a plate or tube to two or more corrugating operations, the effect of each successive operation being to maintain the pitch of the ridges and to cause the plate or the wall of the tube to assume a form as seen in longitudinai section more nearly approaching the intended final form, the pressure being so applied in successive operations as to gradually change the sectional form of the plate or tube Without unduly distressing or thinning the metal. The first operation forms deep and wide, but not steep-sided ridges, and the succei-idii'ig operation or operations applies or apply pressure in a direction approximately normal to the general plane of the plate or to the axis of the tube to the sides of the ridges chiefly, so as to widen the valleys between the ridges by steepening the sides of the ridges, the pitch of which remains substantially the same as after the lirst operation that is to say, the lirst operation having stretched the metal more or less equally throughout, the succeeding operations practically change the position of the material without further stretching it or altering the pitch of the ridges.

, in rolling furnaces or lines according to this invention there may be employed a mill or mills similar in general constructnm to ordinary corrugatingmills. The mill rolls may be made of extra length and be formed at different portions with corrugations or ribs of different contours, so that the plate or tube may be submitted to two or more operations between the same rolls by shifting it from one part to another. l l hen rolling ridges into a tube, this avoids reheating of the tube for each operation and changing of the rolls.

Referring to the accompanying drawings, Figures 1. and 2 illustrate sections through a plate or tube wall after the preliminary and linal rolling operations, respimtively. Figs. and 4: illustrate, respectively, the tube after the preliminary corrugating operation and the completed furnace or line tube. Fig. 5 is an elevation of a machine suitable for carrying the invention into effect, the preliminary corrugating being effected at the lefthand portion of the rolls and the final corrugating at the right-hand portion of the rolls.

From Figs. 1 and 2 it will be seen that the effect of the first operation is to practically stretch the material equally throughout, while the effect of the second operation is to alter the position of those portions intermediate between the top middle parts of the ridges and the bottom middle parts of the valleys, the pitch and depth remaining substantially the same and the material not being further stretched to any appreciable extent.

tlteam boiler furnaces and ilues may be formed with deep steep-sided ridges and *al leys by more than two operations, if requirei'l, In the mamlfacturc of furnaces and ilues according to this invention each rolling or pressin operation may be effected in a separate machine; but to avoid loss of time and heat it is preferable to effect two or more operations in a single machine.

1. The manufacture of steam-boiler furnaces and liues by submitting a plate to a pinral i ty of corrugating rolling operations wherein pressure is applied directly to the surfaces of the plate and, at the end of each operation to the whole of both surfaces thereof, the cffeet of each successive operation being to maintain the pitch of the ridges and depth of the valleys and to cause the plate to assume a form more nearly approaching the intended final form, as set forth.

2. The manufacture of steam-boiler furnaces and fines by submitting a plate to a plurality of corrugating rolling operations wherein pressure is applied directly to the surfaces of the plate and, at the end of each operation to the whole of both surfaces thereof, the first operation forming deep and wide but not steepsided hollow ridges and intermediate valleys, and each successive operation maintaining the pitch of the ridges and depth of the valleys and applying pressure to the sides of the ridges chiefly and steepening them and widening the intermediate valleys, as set forth.

3. The manufacture of steam-boiler furnaces or fines by submitting a plate in the form of a tube to a plurality of corrugating operations, the effect of each successive operation being to maintain the pitch of the circumferential ridges and depth of the valleys and to cause the plate to assume a form more nearly approaching the intended final form, as set forth.

at. The manufacture of steam-boiler furnaces or flues by submitting a plate in the form of a tube to a plurality of corrugating operations, the first operation forming deep and wide but not steep-sided hollow ridges and intermediate valleys, and each successive operation maintaining the pitch of the ridges and applying pressure to the sides of the ridges chiefly and steepening them and widening the intermediate valleys, as set forth.

5. The manufacture of steam-boiler furnaces and fiues by submitting a plate to a plu' rality of corrugating rolling operations, the

effect of each successive operation being to maintain the pitch of the ridges and to cause the plate to assume a form more nearly approaching the intended final form, as set forth.

6. The manufacture of steam-boiler furnaces and fiues by submitting a plate to a plurality of corrugatiug rolling operations, the first operation forming deep and Wide but not steep-sided hollow ridges and intermediate valleys, and each successive operation maintaining the pitch of the ridges and applying pressure to the sides of the ridges chiefly and steepening them and widening the intermediate valleys, as set forth.

7. The manufacture of steam-boiler furnaces and fines by submitting a plate to aplurality of corrugating rolling operations, the

effect of each successive operation being to maintain the pitch of the ridges and depth of the valleys and to cause the plate to assume a form more nearly approaching the intended final form, as set forth.

8. The manufacture of steam-boiler furnaces and fines by submitting a plate to a plurality of corrugating rolling operations, the first operation forming deep and wide but not steep-sided hollow ridges and intermediate valleys, and each successive operation maintaining the pitch of the ridges and depth of the valleys and applying pressure to the sides of the ridges chiefly and steepening them and widening the intermediate valleys, as set forth.

Signed at Leeds, county of York, England, this 1st day of February, 190a.

ERNEST GEARING. \VILLlAM RAINFORTH.

Witnesses:

\VILLIAM JOHNSTON, 'HARRY SIDNEY Hnrworurn. 

